/Engine/Source/Runtime/Engine/Classes/Kismet/KismetStringLibrary.h
Concatenates an array of strings into a single string.
The final, joined, separated string.
static [FString](API\Runtime\Core\Containers\FString) JoinStringArray ( const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & SourceArray, const [FString](API\Runtime\Core\Containers\FString) & Separator )